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Configuration Guide - Security

S1720, S2700, S5700, and S6720 V200R011C10

This document describes the configurations of Security, including ACL, local attack defense, MFF, attack defense, traffic suppression and storm control, ARP security, Port security, DHCP snooping, ND snooping, PPPoE+, IPSG, SAVI, URPF, keychain, MPAC, separating the management plane from the service plane, security risks, PKI.
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Understanding Traffic Suppression

Understanding Traffic Suppression

Traffic suppression prevents broadcast storms caused by broadcast, unknown multicast, and unknown unicast packets, and is configured in the following views:

  • Interface view

    Controls the bandwidth percentage, packets per second, and bits per second of incoming packets.

    A switch monitors rates of these packets on the interface and compares the rates with the thresholds. When the rate of incoming traffic reaches the threshold, the switch discards excess traffic.

  • Outbound interface view

    Blocks outgoing broadcast packets, unknown multicast packets, and unknown unicast packets.

  • VLAN view

    Limits the bits per second for broadcast packets.

    A switch monitors broadcast packet rates in the same VLAN and compares the rates with the thresholds. When the traffic rate in the VLAN reaches the threshold, the switch discards excess traffic.

By default, the device supports traffic suppression triggered by MAC address flapping. When MAC address flapping detection is enabled, traffic suppression will be triggered on the interface where MAC address flapping occurs. That is, the rate of unknown unicast packets is limited to 50% of the interface bandwidth.
NOTE:

If traffic suppression on unknown unicast packets is configured using the unicast-suppression command and the rate limit of unknown unicast packets is not 100% of the interface bandwidth, or storm control on unknown unicast packets is configured using the storm-control command, traffic suppression will not be triggered on an interface where MAC address flapping occurs.

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Updated: 2019-09-23

Document ID: EDOC1000178177

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